Re: [Qemu-devel] [PATCH] 9pfs: drop v9fs_register_transport()

[Greg Kurz <groug@kaod.org>]

Stefano, can you ack/nack this one ?

On Wed, 20 Dec 2017 20:42:54 +0100
Greg Kurz <groug@kaod.org> wrote:

> No good reasons to do this outside of v9fs_device_realize_common().
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
>  hw/9pfs/9p.c               |    6 +++++-
>  hw/9pfs/9p.h               |   10 ++--------
>  hw/9pfs/virtio-9p-device.c |    8 ++------
>  hw/9pfs/xen-9p-backend.c   |    3 +--
>  4 files changed, 10 insertions(+), 17 deletions(-)
> 
> diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
> index ccbc75265a52..2f836a59deac 100644
> --- a/hw/9pfs/9p.c
> +++ b/hw/9pfs/9p.c
> @@ -3502,7 +3502,8 @@ void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr)
>  }
>  
>  /* Returns 0 on success, 1 on failure. */
> -int v9fs_device_realize_common(V9fsState *s, Error **errp)
> +int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t,
> +                               Error **errp)
>  {
>      int i, len;
>      struct stat stat;
> @@ -3510,6 +3511,9 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
>      V9fsPath path;
>      int rc = 1;
>  
> +    assert(!s->transport);
> +    s->transport = t;
> +
>      /* initialize pdu allocator */
>      QLIST_INIT(&s->free_list);
>      QLIST_INIT(&s->active_list);
> diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
> index ea7657837784..e2aa64577fe1 100644
> --- a/hw/9pfs/9p.h
> +++ b/hw/9pfs/9p.h
> @@ -346,7 +346,8 @@ void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...);
>  void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
>  int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
>                        const char *name, V9fsPath *path);
> -int v9fs_device_realize_common(V9fsState *s, Error **errp);
> +int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t,
> +                               Error **errp);
>  void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
>  
>  V9fsPDU *pdu_alloc(V9fsState *s);
> @@ -366,11 +367,4 @@ struct V9fsTransport {
>      void        (*pdu_complete)(V9fsPDU *pdu, bool discard);
>  };
>  
> -static inline int v9fs_register_transport(V9fsState *s, const V9fsTransport *t)
> -{
> -    assert(!s->transport);
> -    s->transport = t;
> -    return 0;
> -}
> -
>  #endif
> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> index d874f48467ba..806e7573276c 100644
> --- a/hw/9pfs/virtio-9p-device.c
> +++ b/hw/9pfs/virtio-9p-device.c
> @@ -201,17 +201,13 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
>      V9fsVirtioState *v = VIRTIO_9P(dev);
>      V9fsState *s = &v->state;
>  
> -    if (v9fs_device_realize_common(s, errp)) {
> -        goto out;
> +    if (v9fs_device_realize_common(s, &virtio_9p_transport, errp)) {
> +        return;
>      }
>  
>      v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
>      virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
>      v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
> -    v9fs_register_transport(s, &virtio_9p_transport);
> -
> -out:
> -    return;
>  }
>  
>  static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
> diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> index dc1e6c88885d..e2ae1ac148eb 100644
> --- a/hw/9pfs/xen-9p-backend.c
> +++ b/hw/9pfs/xen-9p-backend.c
> @@ -448,7 +448,6 @@ static int xen_9pfs_connect(struct XenDevice *xendev)
>      xen_9pdev->id = s->fsconf.fsdev_id =
>          g_strdup_printf("xen9p%d", xendev->dev);
>      xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
> -    v9fs_register_transport(s, &xen_9p_transport);
>      fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
>              s->fsconf.tag,
>              1, NULL);
> @@ -457,7 +456,7 @@ static int xen_9pfs_connect(struct XenDevice *xendev)
>      qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
>      qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
>      qemu_fsdev_add(fsdev);
> -    v9fs_device_realize_common(s, NULL);
> +    v9fs_device_realize_common(s, &xen_9p_transport, NULL);
>  
>      return 0;
>  
>